A scheme of selective removal of metal ions from chromium-containing synthetic solutions with the following chemical composition, Cr (VI)-Fe (III), Cr (VI)-Fe (III)-Ni (II), Cr (VI)-Fe (III)-Ni (II)-Zn (II), and Cr (VI)-Fe (III)-Ni (II)-Zn (II)-Cu (II)) by Shewanella xiamenensis biofilm immobilized on a zeolite support, was proposed. Three biological processes, biosorption, bioaccumulation, and longtime bioreduction, were applied for metal removal. The process of Zn (II), Ni (II), and Cu (II) showed to be pH dependent. The maximum removal of Ni (II) was achieved during a 1-hour biosorption process at pH 5.0-6.0, of Zn (II) at pH 5.0, and of Cu (II) at pH 3.0. Chromium (VI) and Fe (III) ions were more efficiently removed by bioaccumulation. Chromium (VI) removal in the studied systems varied from 16.4% to 34.8 and of iron from 55.8 to 94.6%. In a long-term bioreduction experiment, it was possible to achieve complete reduction of Cr (VI) to Cr (III) ions by Shewanella xiamenensis in 42 days and by Shewanella xiamenensis biofilm on zeolite in 35 days. Shewanella oneidensis can be effectively used to remove metal ions from chemically complex effluents.

中文翻译：

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使用载于沸石上的厦门希瓦氏菌生物膜从含铬的合成废水中选择性去除金属。

从以下化学组成的含铬合成溶液中选择性除去金属离子的方案：Cr（VI）-Fe（III），Cr（VI）-Fe（III）-Ni（II），Cr（VI）-厦门希瓦氏菌生物膜固定在沸石载体上的Fe（III）-Ni（II）-Zn（II）和Cr（VI）-Fe（III）-Ni（II）-Zn（II）-Cu（II） ，已提出。三种生物过程，即生物吸附，生物富集和长期生物还原，都用于去除金属。Zn（II），Ni（II）和Cu（II）的过程显示出与pH有关。在pH 5.0-6.0的1小时生物吸附过程中，在pH 5.0的Zn（II）和pH 3.0的Cu（II）吸附过程中，最大程度地去除了Ni（II）。通过生物富集可更有效地去除铬（VI）和铁（III）离子。在研究的系统中，铬（VI）的去除率从16.4％到34.8％，铁的去除率从55.8％到94.6％。在一个长期的生物还原实验中，可能在42天之内通过厦门希瓦氏菌和在沸石上的厦门希瓦氏菌生物膜将Cr（VI）完全还原为Cr（III）离子。沙瓦氏菌可以有效地用于从化学复杂的废水中去除金属离子。